In a curved space-time like the one were in, the entropy of a quantum object depends on how youre travelling when you measure itRostislav Zatonskiy/AlamyOur two best theories of the physics of the universe quantum mechanics and general relativity often fail to agree. Physicists have been trying to unite them for over a century, and now, researchers have found one place where they dont seem to clash. Working out from this one example may open the doors for building a more general, universe-wide theory.It